Sea pig or seapig may refer to:
Animals Scotoplanes, a genus of deep-sea holothurians (sea cucumbers) commonly called sea pigs An obsolete name for the Eastern smooth boxfish Sea Swine (a.k.a. Porcus Marinus), a historical name for porpoise and mythical creatures A local name for the dugong The name of guinea pigs in some countries Hawaiian flagtail, sometimes called puaʻa kai (sea pig)
Other uses "The Sea Pig", an episode from the PBS series Songs For Unusual Creatures by Michael Hearst